The only thing the actress worries about is gaining weight around
her bottom, and so to keep it off, she does cardio, weight training, ballet-style bar training, kickboxing, four times a week.
"I worry about gravity taking its toll, and that's why I work out regularly -- anything for my butt," she admitted.
"But I also do it because it keeps me healthy, not to lose weight. I get ill less and feel fresher when I exercise.
"Then I often go home, eat chocolate ice cream and tell myself it's all right because I've balanced it out with the exercise!" she added.
Photograph: Sean Gallup/Getty Images
Also see: Skinny? 10 tips to gain weight